Find tables with foreign keys that might reference deleted rows (integrity issues).
AI agents call PostgreSQL_foreign_key_orphaned_references to retrieve information from Postgres without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a data integrity audit by querying PostgreSQL system catalogs and table contents to identify orphaned foreign key references. It is purely informational/diagnostic in nature - it does not modify, delete, or execute operations, only retrieves and analyzes existing data to report integrity issues. The 'Find' verb and focus on detection rather than remediation confirms this is a Read operation.
From the tool's definition Tool description states 'Find tables with foreign keys that might reference deleted rows' - this is a diagnostic query operation that retrieves and analyzes data without modifying it.
Documented attack patterns abuse exactly the kind of access PostgreSQL_foreign_key_orphaned_references gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Postgres, and nothing reaches the server without passing your rules. This is the rule we recommend for PostgreSQL_foreign_key_orphaned_references:
{
"version": "1",
"default": "deny",
"tools": {
"PostgreSQL_foreign_key_orphaned_references": {}
}
}PostgreSQL_foreign_key_orphaned_references is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Find tables with foreign keys that might reference deleted rows (integrity issues). It is categorised as a Read tool in the Postgres MCP Server, which means it retrieves data without modifying state.
Register the Postgres MCP server in PolicyLayer and add a rule for PostgreSQL_foreign_key_orphaned_references: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Postgres. Nothing to install.
PostgreSQL_foreign_key_orphaned_references is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the PostgreSQL_foreign_key_orphaned_references rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for PostgreSQL_foreign_key_orphaned_references. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
PostgreSQL_foreign_key_orphaned_references is provided by the Postgres MCP server (mukul975/postgres-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Postgres, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
239 Postgres tools catalogued and risk-classified — across an index of 43,000+ MCP servers.